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here is a book that says on pg 134 of the book that there is a plant that created 70,000 tonnes per year of propionaldehyde using wilkinson's catalyst for the process

http://books.google.com/books?id=OUGVPYqtnNgC&pg=PA128&lpg=PA128&dq=hydroformylation+catalysts+propionaldehyde&source=bl&ots=J9s_DhmqoG&sig=V5M69xxEiBZyOcvD6mmYpVuRFqI&hl=en&ei=lk5kTfuiFpz69gT87KyqAg&sa=X&oi=book_result&ct=result&resnum=4&ved=0CDEQ6AEwAw#v=onepage&q=hydroformylation%20catalysts%20propionaldehyde&f=false

-Mrunal